Gas-furnace for steam-boilers.



No. 7n|,a6|,. v Pafented :une llo, |902. E. J. nuFF.

GAS FURNAG FOR STEAM BOILERS.

(Application filed July 17, 1901.) (No Model.) l, 3 Sheets-Sheet l.l

N0. 70|,86l. Pa'fented June |0, |902.

' E. J. DUFF.

GAS FURNACE FOR STEAM BOILEFIS.`

(Application led July 17, 1901.)

3 Sheets-Sheet 2.

(No Mudel.)

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No. 701,861. Patented lune I0, |902.

E. J. DUFF.

GAS FURNACE FR STEAM BOILERS.

(Appucaeien med .my 17, 1901.)

3 Sheets-Sheet 3.

(Ilo Model.)

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UNITED STATES..A

,PATENT OFFICE.

EDWARD JAMES DUFF, OF LIVERPOOL, ENGLAND, ASSIGNOR OF kONE-HALF UNITED ALKALI COMPANY, LIMITED, OF LIVERPOOL, ENGLAND.

GAS-FURNACE FOR STEAiVl-BOILERS.

SPECIFILATION forming part of Letters Patent No. 701,861, dated J' une 10, 1902. Application filed July 1'7, 1901. Serial No. 68,663. (No model.)

To LZZ whom it may concern:

' Be it known that I, EDWARD JAMES DUFF, engineer, a subject of the King of Great Britain and Ireland, residing at James street,

5 Liverpool, in the county of Lancaster, England, have invented certain new and useful Improvements in Gas-Furnaces for Steam- Boilers or for other Heating Purposes; and I do hereby declare the following to be a full,

1o clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use'the same.

This invention relates to gas-furnaces, and I5 is especially intended forrapplication to the furnace of steam-boilers; but it can also be employed for furnaces used for other'heating purposes. f

The said invention has for its object to provide means whereby the gas is Very efficiently consumed and the otherwise'waste heat utilized.

According to this invention, the airto be mixed with the gas for consumption is passed z5 through a passage or passages arranged, as hereinafter described, in proximity to another passage or other passages through which the products of combustion from the furnace pass, the said air then passing into the hereinafterdescribed combustion-chamber through perforations arranged on either side of perforations through which the gas is admitted to the said combustion-chamber, so that the jets of gas issue between and are crossed by jets of heated air, insuring perfect intermingling or mixture of the air and gas, the combustion which takes place being perfected by the baffling actions of perforations through which the gases pass from the combustion-chamber to the boiler or other place Where the heat is to be utilized.

The following is a description, with reference to the accompanying drawings, of the arrangement according to this invention as applied to a water-tube boiler, from which its general application to other heating purposes will also be understood.

Figure l is a Vertical longitudinal section on the line A B O D, Fig. 2. tional plan, one half on the line E F and the other half on the line G H, Fig. l. Fig. 3 is a transverse section on the line I J, Fig. l;

Fig. 2 is a sec-Y and Fig. 4 is a transverse section on the line K L, Fig. 1.

The gas enters by the gas-flue a and valve b and passes by the iiue c to and through the ports d, consisting of long narrow slits in the bottom of the combustion-chamber e. The said combustion-chamber is made, as shown, of a smaller capacity at bottom than at top, 6o so that the mixture of gas and air expands as it passes upward to the ports h in the roof of the combustion-chamber. As the gas enters the vsaid combustionchamber through the ports d heated air meets it, the said air being directed so that the streams thereof cross the streams of gas from either side, the said air entering by the valve fand passing along the narrow central flue g and branch lues g g2 around the base of the combustion-chamber 7c e, into which chamber it passes by the ports f in streams, which meet and cross the gasstreams as aforesaid, so as to thereby insure perfect mixture or intermingling of the air and gas,combustion takingplace and the gases passing from upward in the combustion-chamber c, expanding as they so pass upward, and then passing through the perforations hf in the arched top 7L, which perforations by their bafliing effect perfect and complete the inter- 8o mingling and combustion of the gases, which then pass in contact with the heating-surfaces of the boiler and out by ilues 7c 7c to the chimney. The said ues k 7c' are arranged alongside the central narrow air-flue g, so as to eiect 8 5 preheating of the incoming air on its Way to meet the gas in thevcombustion-chamber e. As shown in Figs. l and 3, the flue g is of elongated cross-section, with its narrow side in contact with and presenting alimited area 9o to the heating chamber or-space containing the boiler or like structure and its wider side in contact with and presenting alarger area to the discharge flue or flues, so that the maximum heat is extracted from the outgoing hot gases to heat the incoming fresh air when the least possible heat is extracted from the heating-chamber. These iiues for the escaping products of combustion and the inincoming air, respectively, may be increased roc in number and be arranged alternately, so as to eect a further division of the currents of escaping products of combustion and division of the incoming air-current; but in any case they are arranged substantially as shown; viz.,so thatthe air-passages which pass near to the space containing the boiler (or the equivalent) are narrow and have but a small area presented to the said space containing the boiler, so as not to deprive the boiler (or the equivalent) of heat; but the said air-passages have as much of their area as possible presented to the escape-dues 7c 7c', so as to abstract as much as possible ot' the heat from the otherwise waste gases leaving the space containing the boi1er-(or the equivalent.)

I claim as my inventionl. In gas-furnaces, a combustion-chamber having.r a perforated arch at top and inletports for gas at bottom and inlet-ports for air at each side so arranged that the streams of gas are met and crossed by incoming streams of air proceeding from opposite sides of the streams of gas, a heating-chamber into which the hot gases are discharged from said combustion-chamber, discharge flue or flues leading from said heating-chamber, and an air- Hue of elongated cross-section for supplying fresh air to theair-inlet ports, said flue having its narrow side in contact with and presenting a limited area to the heating-chamber and its wider side in contact with and presenting a larger area to the discharge flue or flues, whereby the maximum heat may be derived from the hot gases leaving the heating-chamber through the discharge flue or tiues for preheating the air and the least heat extracted from the heating chamber, substantially as described.

2. In gas-furnaces, a combustion-chamber small at bottom and havinga perforated arch at top, and gas-inlet ports at bottom and inlet-ports for air at each side so arranged that the streams of gas are met and crossed by incoming streams of air proceeding from opposite sides of the streams of gas, a heatingchamber into which the hot gases are discharged from said combustion-chamber, discharge lue or lines leading from said heatingchamber, and an air-fine of elongated crosssection for supplying fresh air to the air-inlet ports, said ue having its narrow side in contact with and presenting a limited area to the heating-chamber and its wider side in contact with and presenting a larger area to the discharge flue or flues, whereby the maximum heat may be derived from the hot gases leaving the heating-chamber through the discharge line or flues for preheating the air and the least heat extracted from the heatingchamber, substantially as described..

In testimony whereof I ax my signature in presence of two Witnesses.

EDVARD JAMES DUFF.

Witnesses:

WILLIAM ANDERSON, JAMES PAToN. Jr. 

